#include<stdio.h>
int is_leap_year(int y){
	if ((y % 4 == 0) && (y % 100 != 0) || (y % 400 == 0))
	return 1;
	else
	return 0;
}
int main(){
	int year = 0;
	for(year = 1000;year <= 2000;year++){
		if (is_leap_year(year))
		printf("%d ",year);
	}
	return 0;
}
